Quantum metrology based on symmetry-protected adiabatic transformation: Imperfection, finite time duration, and dephasing

TL;DR

This paper proposes a quantum metrology scheme using symmetry-protected adiabatic transformation with a ferromagnetic Ising model, achieving high precision without requiring precise control of individual qubits, and analyzes its robustness against imperfections and dephasing.

Contribution

It introduces a novel quantum metrology approach that maps parity information to global magnetization, eliminating the need for individual qubit control and demonstrating robustness against practical imperfections.

Findings

Achieves Heisenberg limit estimation via symmetry-protected adiabatic transformation.

Demonstrates the scheme's robustness against finite-time effects and dephasing.

Shows comparable or improved performance over classical schemes under realistic conditions.

Abstract

The aim of quantum metrology is to estimate target parameters as precisely as possible. In this paper, we consider quantum metrology based on symmetry-protected adiabatic transformation. We introduce a ferromagnetic Ising model with a transverse field as a probe and consider the estimation of a longitudinal field. Without the transverse field, the ground state of the probe is given by the Greenberger-Horne-Zeilinger state, and thus the Heisenberg limit estimation of the longitudinal field can be achieved through parity measurement. In our scheme, full information of the longitudinal field encoded on parity is exactly mapped to global magnetization by symmetry-protected adiabatic transformation, and thus the parity measurement can be replaced with global magnetization measurement. Moreover, this scheme requires neither accurate control of individual qubits nor that of interaction strength. We discuss the effects of the finite transverse field and nonadiabatic transitions as imperfection of adiabatic transformation. By taking into account finite time duration for state preparation, sensing, and readout, we also compare performance of the present scheme with a classical scheme in the absence and presence of dephasing.